The concept of a contingent revelation of God in Christ denies in principle the possibility of the self-understanding of the I apart from the reference to revelation (Christian transcendentalism). The concept of revelation must, therefore, yield an epistemology of its own. But inasmuch as an interpretation of revelation in terms of act or in terms of being yields concepts of understanding that are incapable of bearing the whole weight of revelation, the concept of revelation has to be thought about within the concreteness of the conception of the church, that is to say, in terms of a sociological category in which the interpretation of act and of  being meet and are drawn together into one. (Dietrich Bonhoeffer, Act and Being [DBW 2; Fortress, 1996], 31)

(Which raises interesting critical questions about the new theme of the Lutheran Church-Missouri Synod, Martyria, Diakonia, Koinonia, which itself has been one of the slogans of the World Council of Churches for decades. Act or being?)